Not really, it's hard to keep people interested in serversitting and not start noob-bashing instead. I mean, the general TA concept is great, but the burnout rate is way too high there. Newcomers are a headache and helping them voluntarily for a long period of time is something only a few people would do. Then again, you have to control them afterwards.
Having a bot stay in all beginner rooms that'd just say basic hints can help though. Will answer most of the typical questions and will be there 24/7. Not as good as a real human in terms of communication but it's less likely to cause problems.

Anyway HS already started covering some of ex-TA's duties, they'll probably recruit more people at some point if it pays off.